I'm planning on just doing a PBW soak and then rinse with hot water and Star San... But I'm leery of reusing the QDC, dispense line and cobra tap on regular beers now. Am I being nutty or would you suggest these all be dedicated for only sours from this point on?

There is no worry with ANY* organisms on equipment that is small enough to be boiled. Hoses, taps, fittings, etc that can fit in a boil pot will be free of any contaminants after boiling. The problem comes with larger vessels that can't be boiled. Then you have to rely (hope) that a sanitizer can do its job.

* OK thermophylic organisms might not be eradicated through boiling, but they are not typically a problem in the brewery.

What's the best way to clean the hoses and the cobra tap? I clean my kegs with PBW solution and force the PBW solution out through my cobra tap, but the lines are not visibly cleaner even after extended soaks. Is it possible to disassemble cobra taps?

What's the best way to clean the hoses and the cobra tap? I will clean my kegs with PBW solution and force the PBW solution out through my cobra tap, but the lines are not visibly cleaner even after extended soaks. Is it possible to disassemble cobra taps?

yup,

At least with mine you can twist the cap at the top, that the thumb lever comes out of, that unscrews and lets you inside the tap. It's pretty simple and easy to clean in there actually.

QDs you can unscrew by using a flat head screw driver in the slot on top of the QD